/** 
 * <pre>项目名称:import-excel-poi-model 
 * 文件名称:ExcelImport.java 
 * 包名:com.jk.util 
 * 创建日期:2018年1月2日下午4:17:41 
 * Copyright (c) 2018, yuxy123@gmail.com All Rights Reserved.</pre> 
 */  
package com.symbio.ishenapi.common.excel;

import java.io.*;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.apache.log4j.Logger;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;


public class ExcelImport {
	//定义日志打印  和文件常量后缀名
	    private static Logger logger  = Logger.getLogger(ExcelImport.class);  
	    private final static String xls = "xls";  
	    private final static String xlsx = "xlsx";
	
	    
	    /** 
	     * 读入excel文件，解析后返回 
	     * @param file
         * @param index //excel数据第几行为有效数据
	     * @throws IOException  
	     */  
	    public static List<String[]> readExcel(File file,int index) throws IOException{
	        //检查文件  
	        boolean checkFile = checkFile(file);  
	        if(checkFile){
	        	//获得Workbook工作薄对象  
		        Workbook workbook = getWorkBook(file);  
		        //创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回  
		        List<String[]> list = new ArrayList<String[]>();  
		        if(workbook != null){  
		            for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
		                //获得当前sheet工作表  
		                Sheet sheet = workbook.getSheetAt(sheetNum);  
		                if(sheet == null){  
		                    continue;  
		                }  
		                //获得当前sheet的开始行  
		                //int firstRowNum  = sheet.getFirstRowNum();
		                //获得当前sheet的结束行  
		                int lastRowNum = sheet.getLastRowNum();  
		                //循环除了第一行的所有行  
		                for(int rowNum = index-1;rowNum <= lastRowNum;rowNum++){
		                    //获得当前行  
		                    Row row = sheet.getRow(rowNum);  
		                    if(row == null){  
		                        continue;  
		                    }  
		                    //获得当前行的开始列  
		                    int firstCellNum = row.getFirstCellNum();  
		                    //获得当前行的列数  
		                    int lastCellNum = row.getLastCellNum();
		                    String[] cells = new String[row.getLastCellNum()];
		                    //循环当前行  
		                    for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){  
		                        Cell cell = row.getCell(cellNum);  
		                        cells[cellNum] = getCellValue(cell);  
		                    }  
		                    list.add(cells);  
		                }  
		            }  
		            
		            //((InputStream) workbook).close();  
		        }  
		        return list;  
	        }else{
	        	return null;
	        }
	        
	    }
	
   //判断文件是否为.xls或者.xlsx文件
	public static boolean checkFile(File file) throws IOException{
		boolean flag=true;
		//判断文件是否存在  
        if(null == file){  
        	flag=false;
            logger.error("文件不存在！");  
            throw new FileNotFoundException("文件不存在！");  
        }  
        //获得文件名  
        String fileName = file.getName();
        //判断文件是否是excel文件  
        if(!fileName.endsWith(xls) && !fileName.endsWith(xlsx)){  
        	flag=false;
            logger.error(fileName + "不是excel文件");  
            throw new IOException(fileName + "不是excel文件");  
        }
		return flag;  
    }
	
	public static Workbook getWorkBook(File file) {
        //获得文件名  
        String fileName = file.getName();
        //创建Workbook工作薄对象，表示整个excel  
        Workbook workbook = null;  
        try {  
            //获取excel文件的io流  
            InputStream is = new FileInputStream(file);
            //根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象  
            if(fileName.endsWith(xls)){  
                //2003  
                workbook = new HSSFWorkbook(is);  
            }else if(fileName.endsWith(xlsx)){  
                //2007  
                workbook = new XSSFWorkbook(is);  
            }  
        } catch (IOException e) {  
            logger.info(e.getMessage());  
        }  
        return workbook;  
    }  
    public static String getCellValue(Cell cell){  
        String cellValue = "";  
        if(cell == null){  
            return cellValue;  
        }  
        //把数字当成String来读，避免出现1读成1.0的情况  
        if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){  
            
            //判断是否是日期类型 如果是日期类型 处理成日期类型
            if (HSSFDateUtil.isCellDateFormatted(cell)) {
            	Date d = cell.getDateCellValue();
            	SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            	cellValue=sdf.format(d);
            	return cellValue;
            }else{
            	cell.setCellType(Cell.CELL_TYPE_STRING); 
            }
            	
        }  
        //判断数据的类型  
        switch (cell.getCellType()){  
            case Cell.CELL_TYPE_NUMERIC: //数字  
                cellValue = String.valueOf(cell.getNumericCellValue());  
                break;  
            case Cell.CELL_TYPE_STRING: //字符串  
                cellValue = String.valueOf(cell.getStringCellValue());  
                break;  
            case Cell.CELL_TYPE_BOOLEAN: //Boolean  
                cellValue = String.valueOf(cell.getBooleanCellValue());  
                break;  
            case Cell.CELL_TYPE_FORMULA: //公式  
                cellValue = String.valueOf(cell.getCellFormula());  
                break;  
            case Cell.CELL_TYPE_BLANK: //空值   
                cellValue = "";  
                break;  
            case Cell.CELL_TYPE_ERROR: //故障  
                cellValue = "非法字符";  
                break;  
            default:  
                cellValue = "未知类型";  
                break;  
        }  
        return cellValue;  
    }
	
}
